Treating diaphyseal femur fractures with a special harness called a Pavlik harness is an option for infants up to age six months. Diaphyseal femur fracture refers to a break in the long shaft of the thigh bone. The harness holds the hips and knees in a bent and separated position until healing takes place. This can take five to six weeks.
Studies are limited in comparing treatment for this problem but it does appear that results are better the younger the child is (up to three and a half months old). The use of a waist-high spica cast is the other option. There can be some problems from the cast rubbing on the leg but it does hold the very active child still. Comparing outcomes between the Pavlik harness and the spica cast shows similar results.
So you may really be looking at what would work best for your child’s size, severity of fracture, your living situation, and your stress level. Each treatment option comes with pros and cons. Since your pediatrician knows your child well, you may want to go over the various issues, factors, and potential complications of the various treatment options before making the final decision. Whichever route you choose, follow-up X-rays will be taken. Should there be any change in the status of the fracture site, treatment can be changed.